JPH11255027A - Mirror driving unit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent any water from approaching into a housing by way of the opening of a semispherical curved part from a clearance between a semispherical projection of the housing and a semispherical curved recess of a holder base. SOLUTION: This mirror driving unit device is equipped with a housing 1 being in corporated with a detection sensor 22a detecting a tilting mechanism and a tilting angle, and a holder base 2 to be attached with a mirror holder carrying a mirror, and in this constitution, a semispherical curved recess 9 for holding the holder base 2 is installed in the housing 1, a semispherical projecting part 20 to be tiltably held by this semispherical curved recess 9 is installed in the holder base 2, a pinching member 33 allowing any tilting motion of the holder base 2 to the housing 1 and pinching these elements from the thickness direction is installed in a through shaft 30, and the semispherical curved recess 9 is provided with an elastic waterproof sealing member 28 on a surface slidingly contacting with the semispherical projecting part 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a mirror driving unit device having a housing having a tilting mechanism built therein and a holder base to which a mirror holder holding a mirror is attached, and tilting the holder base by the tilting mechanism. Things.

[0002]

2. Description of the Related Art Conventionally, a mirror drive unit device includes a housing having a tilt mechanism and a detection sensor for detecting a tilt angle, and a holder base to which a mirror holder carrying a mirror is attached. There is known a configuration in which a base is tiltably held and a holder base is tilted by a tilting mechanism.

In this mirror drive unit, a hemispherically curved concave portion is provided in a housing to define a tilting center of a holder base, and a hemispherical convex portion corresponding to the hemispherically curved concave portion is provided in a holder base. An opening is provided in the center of the recess to allow the swinging of the through shaft, and the through shaft is inserted into the center and clamped by the holding member to press the hemispherical convex portion into the hemispherical curved concave portion, thereby attaching the holder base to the housing. It is configured to be tiltably held.

[0004]

However, in this conventional mirror drive unit device, the housing passes through the opening of the hemispherical curved concave portion from the gap between the hemispherical curved concave portion of the housing and the hemispherical convex portion of the holder base. There is a problem that water enters into the inside and short-circuits of electronic devices such as sensors in the housing, and a problem that rust occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a housing through a gap between a hemispherical convex portion and a hemispherical curved concave portion and an opening of the hemispherical curved concave portion. To provide a mirror drive unit device for preventing water from entering the inside.

[0006]

In order to solve the above-mentioned problems, a mirror driving unit according to the present invention has a housing in which a tilting mechanism and a detection sensor for detecting a tilting angle are incorporated, and a mirror carrying the mirror. A holder base to which a holder is attached, wherein the housing is provided with a hemispherically curved concave portion for holding the holder base while defining its tilt center, and the holder base is tiltably held by the hemispherically curved concave portion. A mirror drive unit device for tilting the holder base by the tilting mechanism, wherein a penetrating shaft passes through a central portion of the hemispherical curved concave portion and a central portion of the holder base. Penetrating from its thickness direction,
The penetrating shaft is provided with a clamping member for clamping the holder base from the thickness direction thereof in cooperation with the penetrating shaft while allowing the holder base to tilt with respect to the housing. An opening for allowing the through shaft to swing is formed, and in the hemispherically curved concave portion, an elastic waterproof sealing member is provided so as to surround the outer peripheral portion of the opening on a surface that is in sliding contact with the hemispherical convex portion. It is characterized by being provided.

[0007]

FIG. 1 is a sectional view of a mirror driving unit according to the present invention, and FIG. 2 is an exploded perspective view of the mirror driving unit shown in FIG.

In FIG. 1, reference numeral 1 denotes a housing, and 2 denotes a holder base. The housing 1 includes a lower housing 1A and an upper housing 1B.
As shown in FIG. 2, the lower housing 1 </ b> A is provided with a pair of motor installation recesses 3, 3, bearing portions 4, 4 and an annular ridge 5.

The pair of bearings 4, 4 are provided in a direction orthogonal to each other toward the center of the housing.

Lower housing 1A and upper housing 1B
An annular rubber packing 6 having a shape corresponding to the annular ridge 5 is provided between the upper housing 1A and the lower housing 1A. The upper housing 1B is fixed to the lower housing 1A by a screw member (not shown).

Drive motors 7, 7 shown in FIG. 2 are installed in the motor placement recesses 3, 3, respectively. 7a is the drive motor 7
Worm gear attached to the output shaft. The drive motors 7 are used to drive the pair of tilting mechanism assemblies 8. The tilting mechanism assembly 8 will be described later.

A hemispherical curved concave portion 9 for holding the holder base 2 in a tiltable manner is formed in a central portion of the upper housing 1B. Reference symbol O indicates the spherical center of the hemispherical curved concave portion 9. The hemispherically curved concave portion 9 plays a role in defining the tilt center of the holder base 2. A mirror holder (not shown) carrying a mirror is attached to the holder base 2.

The pair of tilting mechanism assemblies 8 are generally constituted by a gear 10, a cap 11, a reciprocating rod 12, and a torsion coil spring 13. The lower portion of the gear body 10 is a hemispherical portion 10b, and the hemispherical portion 10b is rotatably supported by the bearing portions 4 and 4.

A holding portion 14 for rotatably holding the cap 11 is provided at a peripheral portion of the upper housing 1B. The holding portion 14 is provided with a cap pressing member 15.

3, a through hole 15A through which the reciprocating rod 12 is inserted is formed at the center of the gear body 10, and a helical gear 16 is formed at the outer periphery thereof. As shown in FIG. 4, a rod-shaped projection 11a inserted into the hole 13a of the torsion coil spring 13 is formed in the cap 11, and as shown in FIG.
Four engaging claw pieces 11b are formed in the peripheral portion at equal intervals in the circumferential direction. An insertion hole 11c is formed at the top of the cap 11. The rod-shaped projection 11a is
Of the torsion coil spring 13
Is positioned.

The gear body 10 is formed with an engaging hole 10a for engaging with the engaging claw piece 11b.
The gear b is fixed to the gear body 10 by engaging with the engagement hole 10a.

A screw 12a is formed in the body of the reciprocating rod 12, and the rod-shaped spring 13 of the torsion coil spring 13 is formed.
b is engaged with the screw 12a. A spherical portion 12 b is formed on the head of the reciprocating rod 12. Spherical part 12b
Is provided with an engagement projection 12c. A contact portion 18 with which the spherical portion 12b contacts the peripheral portion of the holder base 2 is formed. As shown in FIG. 5, an engagement groove 18a is formed in the contact portion 18, and the engagement protrusion 12c is
8a. The rotation of the reciprocating rod 12 is prevented by the engagement between the engagement protrusion 12c and the engagement groove 18a. The helical gear 16 is meshed with the worm gear 7a.

When the drive motor 7 is driven, the gear 10
And the cap 11 are the bearing part 4 and the cap holding member 1
5, the rotation is transmitted to the reciprocating rod 12 by the engagement of the torsion coil spring 13 and the screw 12a, and the reciprocating rod 12 is reciprocated.

In the housing 1, there is provided a circuit board 21 for mounting a detection sensor (described later) for detecting the tilt of the holder base 2.

The circuit board 21 is fixed to the upper housing 1B by screws 21a.

The circuit board 21 has a pair of detection sensors 22
a, 22b are installed in directions orthogonal to each other. The detection sensors 22a and 22b have engagement projections 23a and 23b.

The engagement projections 23a and 23b are moved by curved plate sensor drive levers 24a and 24b.
Elongated engagement holes 26a, 26b are formed at one end of the sensor drive levers 24a, 24b, and curved guides 26a ', 26b' are formed at the other end. Guide holes 34a and 34b are formed near the guide portions a 'and 26b' of the sensor drive levers 24a and 24b.

The sensor driving levers 24a and 24b are overlapped with each other so that the guide holes 34a and 34b are orthogonal to each other, and are inserted through a through shaft described later. The engagement long holes 26a of the drive levers 24a, 24b,
26b is a holding portion 1 which is engaged with the engagement protrusions 23a and 23b.
4 is covered with a boot 18A for preventing water from entering the housing 1. The cap holding member 15 is provided with a holding projection 19 for holding a boot.

At the center of the holder base 2, a hemispherical convex portion 20 corresponding to the hemispherical curved concave portion 9 is provided as shown in FIG.

The opposite side of the semispherical projection 20 of the holder base 2 is a curved recess as shown in FIG. 2, and a reinforcing rib 29 is formed in the curved recess. An insertion hole 27 is provided at the center of the hemispherical curved recess, and a through shaft 30 is inserted into the insertion hole 27.

An opening 25 is formed in the center of the hemispherical curved concave portion 9. The opening 25 is a swingable space of the shaft portion 33 of the through shaft 30 that swings in accordance with the forward / backward movement of the tilting mechanism assembly 8.

The penetrating shaft 30 has a holding flange 32.
And a shaft portion 33.

The shaft portion 33 passes through the insertion hole 27 and connects the hemispherical convex portion 20 of the holder base 2, the hemispherical curved concave portion 9 of the housing 1, and the guide holes 34a and 34b of the sensor drive levers 24a and 24b in the thickness direction. Penetrates from.

A holding member 31 is provided at an end of the shaft portion 33. The holding member 31 is prevented from falling off the shaft portion 33 by an E-ring 35 serving as a retaining member.

The holding member 31 cooperates with the holding flange portion 32 of the through shaft 30 to play the role of holding the holder base 2 from its thickness direction while allowing the holder base 2 to tilt with respect to the housing 1.

An elastic waterproof seal member 28 has an opening 25 on a surface which is in sliding contact with the hemispherical curved concave portion 9 and the hemispherical convex portion 20.
Is provided so as to surround the outer periphery of the. The elastic waterproofing sealing member 28 includes the holding member 31 and the flange portion 3.
2 presses against the hemispherical curved concave portion 9 and the hemispherical convex portion 20.

At the periphery of the upper housing 1B, four bearing walls 36 for tiltably supporting the holder base 2 are provided, and the bearing walls 36 are arranged at equal intervals so as to surround the hemispherical curved concave portion 9. . At the periphery of the holder base 2, engagement flanges 37 are provided at positions corresponding to the respective support walls 36 so as to engage with the respective support walls 36. The holder base 2 is formed by the hemispherical curved concave portion 9 and the support wall 36. The housing 1 is tiltably held by the housing 1.

At the periphery of the hemispherical projection 20 of the upper housing 1B, four rotation blocking holes 38 are provided so as to surround the hemispherical projection 20. In the periphery of the semi-spherical curved concave portion 9 of the holder base 2, rotation preventing projections 39 engaging with the respective rotation preventing holes 38 are provided at positions corresponding to the respective rotation preventing holes 38.
The rotation preventing hole 38 and the rotation preventing protrusion 3 are provided.
9 prevents rotation of the holder base 2 about the axis of the through shaft 30.

Hereinafter, the operation of the mirror driving unit will be schematically described.

The pair of drive motors 7 are used to move a mirror (not shown) up and down, and the other of the pair of drive motors 7 is used to move the mirror left and right.

As shown in FIG. 1, the drive motor 7 is moved from a state where the holder base 2 is horizontal with respect to the housing 1.
To raise (or lower) one of the advance / retreat lots 12 (in FIG. 7, for convenience of explanation, the spherical portion of the advance / retreat rod 12 which is moved forward / backward is denoted by reference numeral 12b '). Then, the holder base 2 is rotated about a line Y connecting the spherical center O ′ of the spherical portion 12b of the other reciprocating rod 12 of FIG. This rotation causes the through shaft 30 to move around the ball O in FIG.
When the center drive lever 24a swings in the direction B), the center drive lever 24a rotates in the direction of the arrow B '(-B'), whereby the engagement protrusion 23a is moved, and the resistance value of the detection sensor 22a changes. The tilt direction and tilt angle of the holder base 2 are detected.

When the other reciprocating rod 12 is moved forward and backward, the spherical portion 12 of the one reciprocating rod 12 shown in FIG.
The holder base 2 is rotated about a line segment X connecting the ball center O ″ of b ″ and the tilt center. This rotation causes the through shaft 30 to move around the ball center O in FIG.
When the center drive lever 24b swings in the direction C), the center drive lever 24b rotates in the direction of the arrow C '(-C'), whereby the engagement protrusion 23b is moved, and the resistance value of the detection sensor 22b changes. The tilt direction and tilt angle of the holder base 2 are detected.

As described above, the tilting direction and the tilting angle of the holder base 2 tilted about the ball center O by the pair of tilting mechanism assemblies 8 depend on the pair of sensor driving levers 24 a and 24 b interlocked with the through shaft 30. Is detected via

In this mirror drive unit device, when water drops or the like enter the opening 25 through the sliding contact surface between the hemispherical curved concave portion 9 and the hemispherical convex portion 20, the elastic waterproof sealing member surrounds the outer periphery of the opening 25. Thus, water droplets that enter the housing 1B through the opening 25 can be prevented.

[0040]

As described above, the mirror driving unit device according to the present invention has a hemispherically curved concave portion provided in the housing for defining the tilting center of the holder base, and the hemispherically curved concave portion of the holder base. The holder has a structure in which an elastic waterproof seal member is provided on the side of the holder base, which is held to be tiltable, in sliding contact with the hemispherical convex portion so as to surround the opening of the hemispherical curved concave portion that allows the through shaft to swing. It is possible to prevent water from entering the housing without impairing the tilting performance of the base, to prevent malfunctions of electronic equipment, and to prevent the mirror from blurring by using an elastic member as a seal member. Play.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a schematic configuration of a mirror driving unit device according to the present invention.

FIG. 2 is an exploded perspective view illustrating a schematic configuration of a mirror driving unit device according to the present invention.

FIG. 3 is an enlarged perspective view showing the gear body and the cap shown in FIG. 2 in an exploded manner.

FIG. 4 is an enlarged sectional view showing an exploded view of the gear body and the cap shown in FIG. 2;

FIG. 5 is a diagram showing a state in which the reciprocating rod and the contact portion shown in FIG. 1 are viewed from below.

FIG. 6 is a perspective view showing the configuration of the back side of the holder base shown in FIG. 2;

FIG. 7 is a plan view of the holder base shown in FIG.

FIG. 8 is a perspective view showing a schematic configuration of a through shaft, a sensor drive lever, and a detection sensor of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing 2 ... Holder base 8 ... Tilting mechanism assembly 9 ... Semispherical curved concave part 20 ... Semispherical convex part 21 ... Circuit board 22a, 22b ... Detection sensor 24a, 24b ... Sensor drive lever 28 ... Elastic waterproof sealing member 30 ... penetrating shaft 31 ... clamping member

Claims (1)

[Claims] 1. A housing having a built-in tilting mechanism and a detection sensor for detecting a tilting angle, and a holder base to which a mirror holder carrying a mirror is attached, wherein the housing defines the tilting center of the holder base. A hemispherical curved concave portion for holding while holding, a hemispherical convex portion which is tiltably held in the hemispherical curved concave portion is provided on the holder base, and a mirror drive for tilting the holder base by the tilting mechanism In the unit device, a penetrating shaft passes through the central portion of the hemispherical curved concave portion and the central portion of the holder base from a thickness direction thereof, and the penetrating shaft has a tilt of the holder base with respect to the housing. A clamping member for clamping these from the thickness direction in cooperation with the penetrating shaft while allowing them is provided. An opening is provided at a central portion of the hemispherical curved concave portion to allow the through shaft to swing. Drive unit device provided with an elastic waterproof seal member so as to surround